I can feel cold air blowing in the freezer section vents but I dont feel any air in refrigerator vents..
When I check through fingers ...I dont feel or see any frost build up or any other obstruction...

I cleaned condenser coil and evaporator coil both...evaporator fan is working properly..

is it possible that there is frost build up which is blocking air from freezer section to refrigerator and I cant see that frost?